are aux. lenses ava. for the G10?

Thank You for your answer...My local Best Buy was not helpful....JDIII

What are the tele converter & wide angle converter lens used for?

Pardon my being somewhat negative here, but... the whole point of these cameras is simplicity (though it's rather difficult to claim they're 'simple' in any way) and compactness. When you start adding more lenses, etc., you're rather defeating the fundamental purpose.

Finally, you run up against a basic optical/engineering truth: the lens built into the camera is not at its best when using supplementary lenses (even though Canon does offer that teleconverter lens).

If you really want a camera with interchangeable lenses, you should be looking at a DSLR. By the time you add the supplementary lenses you've spent the same amount of money to achieve inferior photographs.